| Summary: | 博士 === 國立成功大學 === 化學工程研究所 === 84 === Titanium alkoxide in strong alkaline condition can react with
strontium ion to become strontium titanate without any
external heat. Because titanium alkoxide is easy to react with
the mois- ture in the air to form hydrolyzed gel of titanium
dioxide to affect the quality of the product. Titanyl acylate
precursor from chelating acetic acid with titanium alkoxide can
be dissolved in water and be reacted with strontium ion to form
strontium titan- ate powder in strong alkaline solution. In the
studies that the preparatory conditions of titanyl acylate
precursor reacting with strontium ion to form strontium
titanate powder in a strong alkaline solution conditions, reac-
tion temperature, the water content of forming titanyl acylate
precursor, the ratio of water/titanium alkoxide and the ratio
of acetic acid/titanium alkoxide, have been studied the effect
on the particle size, stoichometry and sinterability of making
cer- amic powder. The preparatory variables affect indirectly
the amount of chelating acetate group, change the mode of
condensa- tion of the gels and even control the particle size
of the powder . The reaction rate of forming powder, at lower
temperature (room temperature) and less water content (water/
titanium alkoxide = 5) or fewer acetic acid (acetic acid/
titanium alkoxide =5), is slow and the particle size of the
powder is bigger. That the sinter- ability of powder is no so
good. On the contrary, that of form- ing powder, at higher
temperature such as 373 K and more water content (the ratio of
water to titanium alkoxide is 20) or larger acetic acid (the
ratio of acetic acid to titanium alkoxide is 10) , is rapid and
the particle size formed is finer at 0.1um.(omit)
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